@misc{indiciaea21a4bef1b6f,
  title = {Aeromagnetic map of the Freel Peak and Mount Siegel quadrangles, and parts of the Markleeville and Topaz Lake quadrangles, California-Nevada},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1967},
  doi = {10.3133/ofr67237},
  url = {https://pubs.usgs.gov/publication/ofr67237},
  note = {Source identifier: ofr67237}
}